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To the uninitiated, however, the photos, videos, and cryptic comments that kids post on their personal pages often appear as impenetrable as a tenth grader's cluttered locker. Because schools tend to block access to social-networking sites, many educators have a tough time harnessing their potential as a teaching tool and modeling appropriate networking-site behaviors.

While most of our classrooms were built under the assumption that information is scarce and hard to find, nearly the entire body of human knowledge now flows through and around these rooms in one form or another, ready to be accessed by laptops, cellphones, and iPods. Classrooms built to re-enforce the top-down authoritative knowledge of the teacher are now enveloped by a cloud of ubiquitous digital information where knowledge is made, not found, and authority is continuously negotiated through discussion and participation. In short, they tell us that our walls no longer mark the boundaries of our classrooms.

And that’s what has been wrong all along. Some time ago we started taking our walls too seriously – not just the walls of our classrooms, but also the metaphorical walls that we have constructed around our “subjects,” “disciplines,” and “courses.” McLuhan’s statement about the bewildered child confronting “the education establishment where information is scarce but ordered and structured by fragmented, classified patterns, subjects, and schedules” still holds true in most classrooms today. The walls have become so prominent that they are even reflected in our language, so that today there is something called “the real world” which is foreign and set apart from our schools. When somebody asks a question that seems irrelevant to this real world, we say that it is “merely academic.”

We can use them in ways that empower and engage students in real world problems and activities, leveraging the enormous potentials of the digital media environment that now surrounds us. In the process, we allow students to develop much-needed skills in navigating and harnessing this new media environment, including the wisdom to know when to turn it off. When students are engaged in projects that are meaningful and important to them, and that make them feel meaningful and important, they will enthusiastically turn off their cellphones and laptops to grapple with the most difficult texts and take on the most rigorous tasks.

At the root of your question is a much more interesting observation that many of the styles of self-directed learning now enabled through technology are in conflict with the traditional teacher-student relationship. I don’t think the answer is to annihilate that relationship, but to rethink it.

Personally, I increasingly position myself as the manager of a learning environment in which I also take part in the learning. This can only happen by addressing real and relevant problems and questions for which I do not know the answers. That’s the fun of it. We become collaborators, with me exploring the world right along with my students.

our walls, the particular architectonics of the disciplines we work within, provide students with the conversational, narrative, cognitive, epistemological, methodological, ontological, the –ogical means for converting mere information into knowledge.

In other words, what happens to articles once they're posted? Will they be watered down or made inaccurate by someone with no relevant credentials? Wikipedians would argue that credentials are besides the point -- that anyone with a computer can police the encyclopedia by judging source material, sifting through edits and using a neutral tone to describe disputes. It's a dynamic that Sorin Matei, a communications professor at Purdue University, describes this way: "He who can sit for the longest in front of the computer is right."

accountability

But, even though Skype has not been a major financial success, it has succeeded in becoming the dominant internet telephony service globally.